Upgrading from dapper to edgy

[Steven Pasternak]

Hi! Is there an easy way to upgrade from dapper 6.06 to edgy 6.10 
without downloading the cd. I am no linux newbie, but I am somewhat a 
debian newb. I somehow recall being able to replace 'dapper' with 'edgy' 
(actually was 'sarge' to 'etch' when I last tried) and running some apt 
command. Is that safe/recommended or should I just use an installer? Thanks!
-Steven